EPA Forever Chemical

In this Aug. 1, 2018 photo weeds engulf a playground at housing section of the former Naval Air Warfare Center Warminster in Warminster, Pa. In Warminster and surrounding towns in eastern Pennsylvania, and at other sites around the United States, the foams once used routinely in firefighting training at military bases contained per-and polyfluoroalkyl substances, or PFAS. EPA testing between 2013 and 2015 found significant amounts of PFAS in public water supplies in 33 U.S. states.(AP Photo/Matt Rourke)